exam Maths Puzzle Numerical Ability

rewrite 10x-5y=15,so that y is a function of x.

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Could I get some help with this problem please?

Subtract using the vertical method- 7x^2 + 6x from 9x^2 - 3. kevin has $9,300 to invest. He decides to invest a portion of the $9,300 at 4.7% for 1 year and the rest at 5.9% each for 1 year. It the total interest amount that kevin earns is